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    <title>instanceof</title>
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    <!--
        1. instanceof是如何判断的?
        * 表达式: A instanceof B
        * 如果B函数的显式原型对象在A对象的原型链上, 返回true, 否则返回false
        2. Function是通过new自己产生的实例
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    <script>
          console.log(Function instanceof Object);
          console.log(Object instanceof Function);

    </script>
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